Lens assembly



July 31, 1945. T. l. RESS 2,380,613

LENS ASSEMBLY Filed July 19, 1944 2 Shets-Sheet 1 I N VEN TOR.

fia/rzas 4 455 M 31, 1945. RESS LENS ASSEMBLY Filed July 19, 1944 2 Sheets-Sheet 2 INVENTOR. fia/rws i1 5; v flak/955 x7 7 Patented July 311, 1945 LENS ASSEMBLY Thomas I. Bess, Chicago, Ill., assignor to De Vry Corporation, Chicago, Ill., a corporation of Illinois Application July 19, 1944, Serial No. 545,553

Claims.

This invention relates to certain novel improvements in a. lens assembly. especially designed and constructed for use in motion picture projecting machines and commonly referred to as a condenser lens.

The invention has for its principal object the provision of an assembly of this character, the parts of which may be readily and expeditiously taken apart to enable cleaning the lens or replacements thereof.

Another object of the invention is the provision of an improved construction of the character hereinafter described and which will be highly eflicient in use and economical in manufacture.

A still further object of the invention is a lens assembly. which comprises a minimum of parts, thereby facilitating the assembly and disassembly of the same.

Other objects will appear hereinafter.

The inventionconsists in the novel combination and arrangement of parts to be hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings showing the preferred form of construction,-and in which:

Fig. l. is a perspective view of parts of a motion picture projecting machine showing my improved condenser lens assembly associated therewith;

Figs. 2 are side elevational views of the lens assembly in disassembled relation with respect to each other;

Fig. 3 is a face elevational view of a frame embodied in the invention;

Fig. 4 is a face elevational view of a housing embodied in the invention;

Fig. 5 is a face elevational view of amounting block embodied in the invention;

Fig. 6 is a fragmentary sectional detail view of the assembly connecting means embodied in the invention.

Referring particularly to Fig.1, the condenser lens assembly is indicated at i0. and this condenser lens assembly is 'mountedupon a wall -H of the projecting apparatus between and a revolving shutter ii.

The condenser lens assembly, as more particularly shown in Figs. 2 to 5 inclusive. comprises .l frame I having mounted therein in any suitiii this flange i1 is an opening it, for reasons hereinafter set forth.

The condenser lens assembly further includes a housing 20 having opposite open ends. The open end 2| provides aperipheral flange 22. This flange, like the flange ll of the frame ll. provides bayonet slots 23'which are adapted to register with the bayonet slots 18 of the flange II when the latter flange is arranged in flat abutting relation with respect tothe flange 22. in the manner shown in Fig. '1.

The opposite open end of this housing 20 is closed by a lens 24. Portions of the housing. as

indicated at 25. are removed .to provide vent openings to prevent condensation within the housing.

The lens is held in place by a suitable bezel ring 24'.

The housing 20 carries a locking pin 26 adapted to project through the opening l9 when the flange I1 is arranged in flat abutting relation with respect to the flange 22 whereby to properly register the bayonet slots 23 of the housing with the bayonet slots is of the frame M.

, The mounting bracket is indicated at 2'! and comprises aiiat plate 28 having an opening 29 formed therein. Through this opening 29 is adapted to be projected the housing 20 when the flange 2! thereof is arranged in flat abutting relation with respect to the plate 28. This plate 28 carries spring-controlled pins 30 having heads it provided with tapered neck portions 32.. These heads are adapted to pass through the enlarged portions 33 of the bayonet slots is and 23, and when the assembly is shifted the tapered neck portions 32 are then confined in the reduced openings of the bayonet slots t8 and 23 whereby to effect connection between the frame and housing with respect to the bracket 21. By providing the tapered necks 82, the pins 8| can be urged outwardly against the springs 30' to permit the necessary rotation of the frame it and housing 20 relative to the bracket 21 whereby to position the tapered necks in the openings 34. These springs 30' are adjusted upon the pins 2! by suitable nuts 35 threaded upon the threaded a lamp i2 able manner, as by means of abezel ring IS, a

lens I. This frame l4 provides a peripheral flange ll having formed therein, at predeter-- mined points, bayonet slots it. Also formed in portions 38 of the pins .30.

To complete the invention I provide lateral lugs 31 having elongated openings II formed therein through which suitable mounting screws (not shown) are adapted to be passed.

To disassemble the parts to clean the lens or to replace broken lens, all that is necessary to do is to rotate the frame I4 and housing 20 relative to the bracket 21 to dispose the heads 28 of the pins 80 in the enlarged portion at of the bayonet slots I8 and 28 whereupon both the frame It and the housing "may be disassembled from the bracket 21.

The simplicity of construction is obvious from the foregoing description. It is also obvious that I provide a simple structure enabling the condenser lens assembly to be disassembled for any purpose whatsoever.

Having thus described my invention, what I claim as new and desire to protect by Letters Patent is: g

1.'A condenser lens assembly comprising a frame having a peripheral flange provided with bayonet slots therein. a lens mounted in the frame. a housing having at one open end a paripheral flange provided with bayonetv slots adapted to register with the slots of the flange of the frame when said flange is disposed in flat abutting relation with the flange of the housing, a mounting bracket having a. central opening through which the housing is adapted to be pro- .iected, with the flange of the housing disposed against the bracket, a lens mounted in the opposite open end of said housing, and means on said bracket and engageable in said bayonet slots for.

releasably connecting said frame and said housing in assembled relation with respect to each other to said bracket.

2. A condenser lens assembly comprising a frame having a peripheral flange provided with bayonet slots therein, a lens mounted in the frame, a housing having at one open end a peripheral flange provided with bayonet slots adapted to register with the slots of the flange of the frame when said flange is disposed in flat abutting relation with the flange of the housing, a mounting bracket having a central opening through which the housing is adapted to be proiected, with the flange of the housing disposed against the bracket, a lens mounted in the opposite open end of said housing. and means on. said bracket and engageable in said bayonet slots for releasably connecting said frame and said housing in assembled relation with respect to each other to said bracket, said last-named means comprising spring-resisted bolts having heads provided with tapered neck portions adapted to engage said bayonet slots.

3. A condenser lens assembly comprising a frame having a peripheral flange provided with bayonet slots therein, a lens mounted in the frame, a housing having at one open end a no ripheral flange provided with bayonet slots adapted to register with the slots of the flange of the frame when said flange is disposed in flat abutting relation with the flange of the housing. a mounting bracket having a central opening through which the housing is adapted to be pro--v jected, with the flange of the housing disposed against the bracket, a lens mounted in the opposite open end of said housing, means on said bracket and engageable in said bayonet slots for releasably connecting said frame and said housing in assembled relation with respect to each other to said bracket, and a slot and pin connection between the frame and the housing for locating the slots of the flange of the frame in proper coincidental relation with the slots in the flange of the housing.

4. A condenser lens assembly comprising a frame having a peripheral flange provided with bayonet slots therein, a lens mounted in the frame, a housing having at one open end a peripheral flange provided with bayonet slots adapted to register with the slots of the flange of the frame when said flange is disposed in flat abutting relation with the flange of the housing, a mounting bracket having a central opening through which the housing is adapted to be projected. with the flange of the housing disposed against the bracket, a lens mounted in the opposite open end of said housing, means on saidbracket and engageable in said bayonet slots for releasably connecting said frame and said housing in assembled relation with respect to each other to said bracket, said last-named means comprising spring-resisted bolts having heads provided with tapered. neck portions adapted to engage said bayonet slots, and a slot and pin connection between, the frame and the housing for locating the slots of the flange of the frame in proper coincidental relation with the slots in the flange of the housing.

5. A lens assembly comprising a frame having bayonet slots formed therein, a lens mounted in the frame, a cylindrical housing open at both ends and provided with bayonet slots adapted to register with the slots of said frame, a mounting bracket having anepening formed therein for the reception of said housing, a lens mounted 'in said housing, and means carried by the bracket and having tapered portions engageable in said bayonet slots when said slots are arranged it registration with each other for releasably connecting the frame and housing in assembled rela time upon said bracket.

THOMAS E. RESB. 

